Changes

Cleanup python mediator2

* mercurial: switch to mediator=python

* rdiff-backup: switch to mediator=python

* dbus-python: switch to mediator=python

* pipdeptree: switch to mediator=python

* pygobject-3-legacy: switch to mediator=python

* pygobject-3: switch to mediator=python

* docutils: switch to mediator=python

* xmlschema: switch to mediator=python

* tqdm: switch to mediator=python

* py-cpuinfo: switch to mediator=python

* pycairo: switch to mediator=python

* pycairo-12: switch to mediator=python

* pip: switch to mediator=python

* pytest-legacy: switch to mediator=python

* pytest: switch to mediator=python

* coverage: switch to mediator=python

* charset-normalizer: switch to mediator=python
 (commit: 28abba9)